The motion to appoint Congress member P Bhattacharya and nominated member Ashok S Ganguly to the 30-member Committee was adopted by voice vote amid din created by BJP members who argued that the move will affect the balance of the panel.
The motion was moved to fill up two vacancies created in the JPC after the retirement of Opposition DMK member Tiruchi Siva and resignation of E M S Natchiappan (Congress) who became a Minister in July.
The Committee now has 12 members of the ruling UPA -- Congress-11 and NCP-1. Among its outside allies, SP has one member and BSP two members.
Opposition camp has BJP-6, BJD-1, TMC-1, CPI-1, CPI(M)-1, DMK-1 and AIADMK-1. JD(U), which recently split with BJP, has two members.
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The JPC has 20 members from Lok Sabha and 10 from Rajya Sabha.
As soon as the motion was brought in the Upper House in the second attempt since the first one failed last week, BJP members demanded its recall, saying it would have "dangerous implications" as it will not have opposition representation.